Which of the following value center and pump combinations is

Which of the following value center and pump combinations is generally considered to be incorrect? In the circuit below, what would happen if check valve A sticks open? Both pumps would stall. The accumulator would overfill. Both pumps would unload at low pressure. The cylinder rod velocity would increase retracting. The circuit would become inoperative.

Solution

for question number 1 the vavle center and pump cobinations E is correct because of the fact that the center valve position will applied the direction of hydaulic fluid to flow in one dirction.if the pressure of fluid exceeds above design pressure than safety valve operates and reduces pressure and does not cause any damages to piston cylinder arrangements.